Hi Luke,

3 – The page tested has no content at all and no footer so only the header.
The header is under your builder that maybe works with Elementor or WPBakery.
This is not under my control therefore nothing that I can do less contacting you. Maybe you need to optimize using elementor containers or something else.

4- script issue
Kinsta does already that.
https://kinsta.com/blog/wp-rocket/
I talked with Kinsta support and no need to used this part with WpRocket

Regards